JPH07328264A - Manufacture of horizontally fully rotating shuttle and horizontally fully rotating shuttle formed by the same - Google Patents

Abstract

PURPOSE:To fix the phases of a sword tip part and a gear by accurately fastening the main body of an outer shuttle and a bearing inside a metal die. CONSTITUTION:A main body 22 of the outer shuttle placed through a movable positioning pin 52 is fastened to a bearing 26 by die fastening. A gear part 28 and a needle receiving part 28b are formed by injection molding and their phases are fixed. At the time of demolding, the movable positioning pin 52 interlocked with the motion of an ejector plate 44d is moved down through a link 54, and the horizontally fully rotating shuttle is rotated and moved so as not to disturb demolding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a horizontal full-rotary rotary hook which rotates about a vertical axis and a horizontal full-rotary rotary hook formed by the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, in most horizontal full rotary hooks,
It is formed by press-fitting a metal gear formed by cutting into a metal outer pot body formed by cutting of a cast product or a forged product. The gear is formed of a gear portion having a hollow cylindrical outer peripheral surface gear shape and a cylindrical press-fitting portion formed on an end surface of the gear.

Also known is a horizontal full rotary hook in which the material of the gear portion is replaced with metal from resin. This hook is formed by attaching a metal bearing to an outer hook main body made of metal with an adhesive, and attaching a resin gear part formed by injection molding to the bearing and the outer hook main body. It was

[0004]

However, in the conventional method of manufacturing a horizontal full-rotary rotary hook in which a metal gear is press-fitted into a metal outer hook main body, the phase between the sword tip portion of the outer hook main body and the gear is pressed at the time of press-fitting. There is a problem that it cannot be fixed.
In addition, due to accuracy issues, it may be necessary to straighten out the race surface of the outer hook main body based on the inner diameter of the gear after press fitting. Therefore, there is a problem that mass productivity is poor and cost is increased.

Further, in the case of a hook in which only the gear portion is made of resin, the bearing and the gear portion have to be separately assembled to the outer hook main body, which is not efficient.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a manufacturing method capable of easily manufacturing a horizontal full rotary hook.

Further, without separately performing the assembling process of the outer hook main body and the gear, which have been indispensable in the past, the injection molding of the gear portion and the product in which the outer hook main body, the bearing and the gear portion are joined are obtained. Accordingly, it is an object of the present invention to provide a manufacturing method in which the manufacturing time is significantly reduced.

Furthermore, the phase of the sword tip of the outer hook and the gear is fixed by injection molding, so that stable quality is guaranteed, and as a ripple effect thereof, the cost of adjusting parts of the sewing machine is reduced, and the sewing machine It is an object of the present invention to provide a horizontal full-rotary rotary hook, which is highly cost-effective and mass-producible, and a manufacturing method thereof, in which the number of adjustment work steps is reduced.

It is another object of the present invention to provide a manufacturing method that does not require a step of exposing the race surface of the outer hook main body based on the inner diameter of the gear after joining.

Further, when the outer hook main body and the bearing are not fastened in the mold, the gear and the bearing are integrally formed by injection molding, so that the outer hook main body is made more than the conventional hook having the resin gear portion. An object of the present invention is to provide a horizontal full rotary hook, which can reduce the number of times of assembling to a horizontal rotary hook, and a manufacturing method for the same.

[0011]

In order to achieve this object, a method of manufacturing a horizontal full rotary hook according to claim 1 of the present invention is characterized in that a supporting shaft is provided in a mounting hole provided in a central portion of an outer hook main body. The process includes a step of attaching and a step of forming a gear portion by injection molding synthetic resin on the outer peripheral surface of the support shaft.

In the step of mounting the support shaft, the support shaft may be pressed into the mounting hole of the outer pot main body in the mold used for injection molding, or the gear may be formed. In the step, the outer pot main body and the support shaft may be fixed by injection molding a synthetic resin between the outer pot main body and the support shaft.

Further, in the method for manufacturing a horizontal full rotary hook according to a fifth aspect of the present invention, the positioning member for determining the gear phase of the gear section with respect to the tip position of the outer hook main body and the gear section are integrally formed. For injection molding synthetic resin on the outer peripheral surface of the support shaft, and the gear part and the support shaft so that the positioning member formed in that process engages with the engaging part formed on the outer hook main body. And a step of assembling the main body.

The positioning member may be formed as a needle receiving member.

[0015]

In the method for manufacturing a horizontal full rotary hook according to the first aspect of the present invention having the above-mentioned structure, after the support shaft is attached to the attachment hole provided in the central portion of the outer hook main body, the support is supported. A gear portion is formed on the outer peripheral surface of the shaft by injection molding.

Further, in the method for manufacturing a horizontal full-rotary rotary hook according to a fifth aspect of the present invention, the positioning member for determining the gear phase of the gear portion with respect to the sword tip position of the outer hook main body and the gear portion are supported to be integrally formed. After injection molding synthetic resin on the outer peripheral surface of the shaft, the gear portion and the support shaft are assembled to the outer hook body so that the formed positioning member engages with the engaging portion formed on the outer hook body.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 (a) and 1 (b), the horizontal full rotary hook 20 is made of a metal, and has a substantially bowl-shaped outer pot main body 22, a metal hollow cylindrical bearing 26, and a resin pot. , Gear part 28
And the needle receiving portion 28b are integrally formed.

The press-fitting portion 26a of the bearing 26 is attached to the center of the outer pot main body 22 by a mounting hole 2 for press-fitting into the outer pot main body 22.
2a is formed.

Further, a hole 22c for inserting a pin for determining the positional accuracy at the time of press-fitting is provided on the bottom surface of the outer hook main body 22.
However, in addition to being formed at three places, a mounting hole 22d for inserting the needle receiving portion 28b is formed.

On the outer periphery of the bearing 26 other than the press-fitting portion 26a,
A resin gear portion 28 formed by injection molding is formed.

The gear portion 28 has a gear shape formed on a part or the entire surface thereof.

Next, an embodiment embodying a method for manufacturing a horizontal full rotary hook will be described with reference to FIG.

FIG. 2 is a sectional view of a main part of a mold for injection molding corresponding to the case where the horizontal full rotary hook shown in FIG. 1 (c) is cut along line AA, and PL (parting line). )
The upper mold 42 positioned above 40 and the lower mold 44 positioned below are in contact with each other in a mold clamped state, in which the horizontal full rotary hook 20 is mounted in the mold.

The bearing 26 is provided with an ejector pin 46.
The outer hook body 22 is arranged so as to be positioned perpendicular to the race surface 22b. A convex detent 46a is formed on the ejector pin 46, and the detent 46a is fitted in the recess 26b of the bearing 26.

The ejector pin 46 may be an ejector sleeve having a mechanism capable of projecting the sleeve.

The ejector pin 46 is formed with a groove 46b for rotating itself.

Movable mold plate 44 forming a part of the lower mold 44
a or the receiving plate 44b, the groove pin 5 having a protrusion shape
6 is formed, and the groove pin 5 is formed on the inner side above the groove 46b.
6 is configured to hit. Ejector pin 46
Is assembled on the ejector plate 44c.

On the receiving plate 44b, a holding portion 60 for holding the link 54 is formed in the space between the receiving plate 44b and the ejector plate upper portion 44c.

A link 54 is attached to the fulcrum 60a of the holding portion 60.
Is configured to be rotatable about the fulcrum 60a.

The positioning movable pin 52 is used for the needle receiving slide 4
8 and a runner 50 that serves as a flow path when molding the gear portion 28.
Is formed so as not to interfere with the above, from the space between the receiving plate 44b and the ejector plate upper portion 44c, penetrating the receiving plate 44b, the movable side mold plate 44a, and the bottom surface of the outer pot main body 22.

The bush rod 58 is attached to the lower ejector plate 44d.

Positioning movable pins 52 and bush rods 58 are formed on both sides of the link 54 as follows.

One oval link hole 54b is formed on each side of the fulcrum 60a of the link 54.

Bolts and the like can be fixed below the positioning movable pin 52 and above the bush rod 58. For example, when the bolt 62 is used, it is sufficient that the bolt 62 does not come off from the head of the bolt 62 when the bolt 62 is inserted into the link hole 54b.

The link 54 is constructed so that the bolt 54 is fixed to the positioning movable pin 52 and the bush rod 58 through the respective link holes 54b so that the link 54 does not fall out. The fitting of the bolt 62 and the link hole 54b is such that the bolt 62 can move smoothly in the link hole 54b.

Next, in the step of forming the outer pot main body 22, the bearing 26, and the resin gear portion 28 in the mold, the outer pot main body 22 and the bearing 26 are made of the resin gear. Part 2
The step of placing the film in the mold before forming 8 will be described with reference to FIG.

FIG. 3 shows a state in which the upper die 42 and the lower die 44 are open, and the molding product ejection step is completed.

When the ejecting process is completed, the upper ejector plate 44c is positioned below by the spring 64, and the lower ejector plate 44d is positioned below by the spring 66. Since the bush rod 58 is also located below, the positioning movable pin 52 is pushed upward via the link 54.

In this state, the bearing 26 is inserted into the outer peripheral portion of the ejector pin 46 from above the lower die 44, and the detent 46a of the ejector pin 46 is fitted into the concave portion of the bearing 26. The positioning movable pin 52 is inserted into the hole 22c of the outer hook main body 22 from above to position the outer hook main body 22 above the movable side mold plate 44a.

Thereafter, the mold is clamped, that is, the lower mold 44 is moved to the upper mold 4.
When pushed up toward 2, the outer pot main body 22 comes into contact with the fixed side cavity 42c, and is further pushed up until the movable side mold plate 44a and the fixed side mold plate 42b come into contact with each other.
The outer hook main body 22 is pressed against the fixed side cavity 42c, and the press-fitting portion 26a of the bearing 26 is pushed into the mounting hole 22a of the outer hook main body 22 to fasten the bearing 26 and the outer hook main body 22. The press-fitting is performed until the outer bottom surface of the outer hook main body 22 comes into contact with and is fixed to the movable side mold plate 44a. FIG. 2 shows the fixed state.

Thereafter, resin is poured into the cavity formed by the gear cavity 44g and the needle receiving slide 48 and the like by injection molding to form the gear portion 28 and the needle receiving portion 28b. Through the above steps, the horizontal full rotary hook 20 in which the outer hook main body 22, the bearing 26, and the gear portion 28 are integrated is formed.

Next, a method of releasing the horizontal full rotary hook 20 will be described with reference to FIG.

FIG. 4 shows a state in the middle of the extrusion process of the molded product.

After the mold opening between the upper mold 42 and the lower mold 44 is completed, the ejecting pin 70 from the molding machine moves upward, and the lower ejector plate 44d is first pushed upward.
At the same time, the link 54 rotates about the fulcrum 60a, and the positioning movable pin 52 moves downward. This is because when the horizontal full rotary hook 20 is released from the gear cavity 44g, it rises while rotating, so that the positioning movable pin 5
This is because 2 needs to move to a position that does not hinder rotation.

When the ejector pin 70 moves further upward, the lower ejector plate 44d moves to the upper ejector plate 44.
The ejector plate upper part 44c is pushed up by contacting with c. Then, the ejector pin 46 assembled on the ejector plate upper portion 44c becomes the groove pin 56.
With the groove 46b, it rises while rotating, and accordingly, the gear portion 28 is released from the gear cavity 44g,
The horizontal full rotary hook 20 moves upward from the lower mold 44 while rotating and can be taken out.

When the ejecting process is completed, the lower ejector plate 44d is moved by the spring 66 to the movable side mounting plate 44.
e to the upper surface of the ejector plate 44c,
The spring 64 descends. Due to the step of the spacer block 44f, the lower ejector plate 44d and the upper ejector plate 44c are located apart from each other.

The ejector pin 46 includes the groove pin 56 and the groove 4.
With 6b, it descends while rotating and returns to the same position as before the ejection process started. Since the bush rod 58 is fixed downward, the positioning movable pin 52 is pushed up again through the link 54, and the outer hook main body 22 can be placed in the mold.

With respect to the above embodiments, the first and second aspects are set forth.
The method for manufacturing the horizontal full-rotary rotary hook described in the above and the horizontal full-rotary rotary hook described in claim 3 have been described. An example of the method for manufacturing the horizontal full-rotary rotary hook according to claim 5 will be briefly described. The point different from is that the outer hook main body 22 and the bearing 26 are not fastened by pressing, but by pouring resin. The outer pot main body 22 and the bearing 26 are inserted and arranged in the mold, and the gear portion 28 is formed by injection molding.
When the needle receiving portion 28b and the needle receiving portion 28b are integrally formed, the mounting hole 22a
The horizontal full rotary hook 20 is formed by pouring the resin into the gap between the bearing and the bearing 26. In the case of this method, depending on the degree of fitting between the mounting hole 22a and the bearing 26, the positioning movable pin 52,
The link 54 or the like becomes unnecessary.

A brief description will be given of an example of the method for manufacturing the horizontal full-rotary rotary hook and the horizontal full-rotary rotary hook according to claims 5 to 7, in which the bearing 26 is inserted into the mold and the press-fitting portion 26a is inserted.
The gear part and the needle guard are integrally formed by injection molding on the outside of the above. After forming, the gear is press-fitted into the outer hook main body, and at that time, the needle guard functions as positioning during press-fitting so that the phase of the sword tip portion of the outer hook main body and the gear portion are fixed.

The phase between the sword tip portion and the gear portion of the outer hook main body may be devised so that the positions are determined at the time of press-fitting instead of the needle guard.

[0052]

As described above, according to the method of manufacturing the horizontal full-rotary rotary hook of the present invention, the horizontal full-rotary rotary hook can be easily manufactured.

Further, it is not necessary to independently perform the press-fitting process of the gear, which has been indispensable in the past, and the outer hook main body and the bearing can be fastened, and after the fastening, the race surface of the outer hook main body based on the inner diameter of the gear can be used. Since the straightening process is not required, the manufacturing process is simplified and the manufacturing process can be easily performed at low cost.

Further, according to the manufacturing method of the horizontal full-rotary hook of the present invention, it is guaranteed that the phase of the sword tip portion of the outer hook and the gear is fixed, so that the product of which the quality is guaranteed is mass-produced. It has an excellent effect of being able to do.

[Brief description of drawings]

FIG. 1 (a) is a perspective view of a horizontal full rotary hook according to the present embodiment. FIG. 1B is an exploded perspective view of the horizontal full rotary hook according to this embodiment. FIG. 1C is a top view of the horizontal full rotary hook according to this embodiment.

FIG. 2 is a cross-sectional view of a mold showing a state where a horizontal full rotary hook of this embodiment is formed.

FIG. 3 is a cross-sectional view showing a state in which an outer hook main body and a bearing are arranged in the mold open state of the mold.

FIG. 4 is a cross-sectional view showing a state in which the formed horizontal full rotary hook is released from the mold in the mold open state.

[Explanation of reference numerals] 20 horizontal full-rotary hook 22 outer hook main body 22a mounting hole 22b race surface 26 bearing 26a press-fitting portion 28 gear portion 28b needle receiving portion

Claims (7)

[Claims] 1. A method of manufacturing a horizontal full-rotary hook that rotates about a vertical axis, in which a supporting shaft is attached to a mounting hole provided in a central portion of an outer hook main body, and a synthetic resin is attached to an outer peripheral surface of the supporting shaft. And a step of forming a gear portion by injection molding. 2. The method for manufacturing a horizontal full rotary hook according to claim 1, wherein the support shaft is press-fitted into a mounting hole of the outer hook main body in a mold used for the injection molding. 3. A horizontal full rotary hook, which is formed by the manufacturing method according to claim 1. 4. The outer pot main body and the support shaft are fixed by injection-molding a synthetic resin between the outer pot main body and the support shaft in the step of forming the gear. A method for manufacturing the horizontal full-rotary kettle described. 5. A method for manufacturing a horizontal full-rotary rotary hook which rotates about a vertical axis, wherein a positioning member for determining a gear phase of the gear section with respect to a sword tip position of the outer hook main body and a gear section are integrally formed. A step of injection molding synthetic resin on the outer peripheral surface of the support shaft, and the gear part and the support shaft so that the positioning member formed in the step engages with the engaging part formed on the outer hook body. And a step of assembling the main body, the method for manufacturing a horizontal full rotary hook. 6. The method for manufacturing a horizontal full rotary hook according to claim 5, wherein the positioning member is formed as a needle receiving member. 7. A horizontal full rotary hook formed by the manufacturing method according to claim 5.